What is the Best Rust Preventative? - 6 Month Update

Half a year has already passed us by and it's time to look at our rust preventative samples yet again. We're starting to get a pretty clear picture of how these different sprays hold up to the elements. Here are affiliate links to each of the products being tested:
Cosmoline: amzn.to/3Vc4yCW
Boeshield T-9: amzn.to/3j1Y4cr
SP-400 from CRC: amzn.to/3j3mgew
Sprayon LU 710 (pack of 12): amzn.to/3uYNohJ
Loctite PC 9660: amzn.to/3PAbLf4
LPS 3: amzn.to/3FvRVgk
WD-40 Corrosion Inhibitor: amzn.to/3HMwmuS
Original WD-40 in a 55 gallon drum: amzn.to/3W9Wjc2
Fluid Film: amzn.to/4058edA
Still reading the description? Leave a comment about the worst rust you've ever seen on a vehicle. For me, I had a 1990 Ford Ranger that lost significant amount of mass every time I hit a bump. That's nothing compared to the guy I know whose Chevy S10 frame rusted in half. Couldn't happen to a nicer guy.
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[@dancollins1012]

I like the fact you're moving onto recommendations. You are not 'just' some dude on the internet, you've run a decent test, and consistently sought feedback as to the method. Don't be afraid to name winners, that's what viewers are seeking clarity on

[@brucewilliams6292]

Thank you for doing this work. It saves the rest of us from the trial and error method of selecting rust preventative.

[@douglasthompson2740]

I am amazed by your results with the WD-40. When it first came out in the early sixties it was quite a good product but in a few years they changed its formula (ala 'New Coke" You could smell the difference big time! The new formula was heavy with the diesel smell.) to its detriment. I am seventy three years old so I have quite a history with WD and I keep it around for its convenience as a cutting fluid with aluminum and that is the only place I have found it to work. I still vividly remember storing my tools during a move and spraying them with it. Every one especially those with cast tables rusted almost immediately despite being in a closed storage unit (though unheated). Then there was the time in the fall I didn't have anything else handy on my 34 foot boat with all the glass fuse panels (12v) inside the cabin so I sprayed WD on them. 95% failed when we did the spring outfitting. 95%!! I had to clean three dozen glass fuses with a pencil eraser on the contact points. A long and frustrating job but they all resumed working. After spraying them with CRC they performed for several years with no problems. Well I could go on and on (I have a flat learning curve, I guess but the damn stuff is cheap and the spray can always seems to be lurking when I go to lube something!!! Happily I can report I did learn and for the past two or three decades I haven't been disappointed with its performance because it has stayed as a cutting fluid and or a cleaner, never as a preservative or rust preventative. So firmly did it implant in my grey cells that I have no desire to even try their "new formula". I have enjoyed your test video.

[@edpopelas2844]

I’ve long been a fan of Cosmoline especially for deep storage items. Aside from machining aluminum, I’ve given up on WD-40. It’s become the perfume that just lets everyone know you’ve been doing some work in the garage. Impressed with the LP3, may have to pick that one up. If I recall correctly I believe Robin is a fan and used it inside a spindle for corrosion protection. That’s an endorsement all in itself.

[@dustcommander100]

I've made quite a few mistakes in my life, quite a few. But I don't feel like as much a loser after realizing I chose LPS3 over 30 years ago to protect my little teeny lathe (also a mistake - should have gotten a larger one). I had to have seen it used at work. No way I would have known about it otherwise. I admire folks who stick with the commitment to test something for months and then take time to make a good video about it!

[@siccolindsay610]

Thank you for the valuable insight, Mr. Stuart

[@FWSwart999]

Very informative like the previous updates. +1 for a September Update

[@angelramos-2005]

Very good info,Stuart.Thank you and happy summer.

[@jbrownson]

Thanks for doing this experiment

[@TangentJim]

Stuart - I'm impressed. Great video ! --- Jim

[@NikolasSumrak]

Thank you so much for this work!

[@luisgaray2550]

Really informative Stuart. I would be interested in a September update. I'm really surprised on how Boeshield really failed. Thanks for doing this experiment!

[@roberttiu3444]

Thank you. Very very useful for me

[@LDSTurkey]

Thanks for your video. Just in time as I am looking to coat my new utility trailer rims.

[@tallnrough68]

I like the lps3, it’s very resilient to coming off

[@mikevolante7663]

Good work, Appreciated

[@prius9253]

Please add a September update. Great, exceptionally useful series. thanks

[@glenn5ft19]

A friend of mine that restores Hudsons uses PAM cooking oil. I think it’s canola oil. After he has removed the paint on the old fenders by bead blasting or acid dipping he sprays them down with PAM. His words are it is cheap, it works, and it washes off with soap and water. They are stored in his barn so probably experience similar conditions as you indoor samples.

[@Alcorelli1]

Thank you for getting to the point clearly. September please.

[@Rustinox]

A september update could be interesting to see what the sun does on these products.